/* inih -- simple .INI file parser

inih is released under the New BSD license (see LICENSE.txt). Go to the project
home page for more info:

http://code.google.com/p/inih/

*/
#define _CRT_SECURE_NO_DEPRECATE
#include <stdio.h>
#include <ctype.h>
#include <string.h>

#include "ini.h"

#if !INI_USE_STACK
#include <stdlib.h>
#endif

#define MAX_SECTION 50
#define MAX_NAME 50

/* Strip whitespace chars off end of given string, in place. Return s. */
static char* rstrip(char* s)
{
	char* p = s + strlen(s);
	while (p > s && isspace((unsigned char)(*--p)))
		*p = '\0';
	return s;
}

/* Return pointer to first non-whitespace char in given string. */
static char* lskip(const char* s)
{
	while (*s && isspace((unsigned char)(*s)))
		s++;
	return (char*)s;
}

/* Return pointer to first char c or ';' comment in given string, or pointer to
null at end of string if neither found. ';' must be prefixed by a whitespace
character to register as a comment. */
static char* find_char_or_comment(const char* s, char c)
{
	int was_whitespace = 0;
	while (*s && *s != c && !(was_whitespace && *s == ';')) {
		was_whitespace = isspace((unsigned char)(*s));
		s++;
	}
	return (char*)s;
}

/* Version of strncpy that ensures dest (size bytes) is null-terminated. */
static char* strncpy0(char* dest, const char* src, size_t size)
{
	strncpy(dest, src, size);
	dest[size - 1] = '\0';
	return dest;
}

/* See documentation in header file. */
int ini_parse_file(FILE* file,
				   int (*handler)(void*, const char*, const char*,
				   const char*),
				   void* user)
{
	/* Uses a fair bit of stack (use heap instead if you need to) */
#if INI_USE_STACK
	char line[INI_MAX_LINE];
#else
	char* line;
#endif
	char section[MAX_SECTION] = "";
	char prev_name[MAX_NAME] = "";

	char* start;
	char* end;
	char* name;
	char* value;
	int lineno = 0;
	int error = 0;
	int result = 0;

#if !INI_USE_STACK
	line = (char*)malloc(INI_MAX_LINE);
	if (!line) {
		return INI_ERROR_ON_MEMORY_ALLOCATION;
	}
#endif

	/* Scan through file line by line */
	while (fgets(line, INI_MAX_LINE, file) != NULL) {
		lineno++;

		start = line;
#if INI_ALLOW_BOM
		if (lineno == 1 && (unsigned char)start[0] == 0xEF &&
			(unsigned char)start[1] == 0xBB &&
			(unsigned char)start[2] == 0xBF) {
				start += 3;
		}
#endif
		start = lskip(rstrip(start));

		if (*start == ';' || *start == '#') {
			/* Per Python ConfigParser, allow '#' comments at start of line */
		}
#if INI_ALLOW_MULTILINE
		else if (*prev_name && *start && start > line) {
			/* Non-black line with leading whitespace, treat as continuation
			of previous name's value (as per Python ConfigParser). */
			if ((result = handler(user, section, prev_name, start)) != 0 && !error)
			{
#if INI_RETURN_LINE_NUMBER_ON_ERROR
				error = lineno;
#else
				error = result;
#endif
			}
		}
#endif
		else if (*start == '[') {
			/* A "[section]" line */
			end = find_char_or_comment(start + 1, ']');
			if (*end == ']') {
				*end = '\0';
				strncpy0(section, start + 1, sizeof(section));
				*prev_name = '\0';
			}
			else if (!error) {
				/* No ']' found on section line */
#if INI_RETURN_LINE_NUMBER_ON_ERROR
				error = lineno;
#else
				error = INI_ERROR_ON_NO_CLOSING_BRACKET_FOUND;
#endif
			}
		}
		else if (*start && *start != ';') {
			/* Not a comment, must be a name[=:]value pair */
			end = find_char_or_comment(start, '=');
			if (*end != '=') {
				end = find_char_or_comment(start, ':');
			}
			if (*end == '=' || *end == ':') {
				*end = '\0';
				name = rstrip(start);
				value = lskip(end + 1);
				end = find_char_or_comment(value, '\0');
				if (*end == ';')
					*end = '\0';
				rstrip(value);

				/* Valid name[=:]value pair found, call handler */
				strncpy0(prev_name, name, sizeof(prev_name));
				if ((result = handler(user, section, name, value)) != 0 && !error)
				{
#if INI_RETURN_LINE_NUMBER_ON_ERROR
					error = lineno;
#else
					error = result;
#endif
				}
			}
			else if (!error) {
				/* No '=' or ':' found on name[=:]value line */
#if INI_RETURN_LINE_NUMBER_ON_ERROR
				error = lineno;
#else
				error = INI_ERROR_ON_NO_AFFECTATION_OPERATOR_FOUND;
#endif
			}
		}

#if INI_STOP_ON_FIRST_ERROR
		if (error)
			break;
#endif
	}

#if !INI_USE_STACK
	free(line);
#endif

	return error;
}

/* See documentation in header file. */
int ini_parse(const char* filename,
			  int (*handler)(void*, const char*, const char*, const char*),
			  void* user)
{
	FILE* file;
	int error;

	file = fopen(filename, "r");
	if (!file)
		return INI_ERROR_ON_FILE_OPEN;
	error = ini_parse_file(file, handler, user);
	fclose(file);
	return error;
}